When air from your ass gets pushed up through your vagina and it feels like youre farting through your vagina. It is actually physically impossible to make a genuine vag fart unless your ass and vaginal canals are connected. Then youd be shitting through your vagina. A vag fart is also know as a queef.

Person 1:Oh look I just made a vag fart!
Person 2: How did it feel?
Person 1: weird but crisp and refreshing